KUALA LUMPUR - Malaysia's state-run oil and gas company Petroliam Nasional Bhd., or Petronas, hasn't signed any pact with Brazil's OGX Petroleo e Gas Participacoes SA or any other company to purchase rights in a Brazilian oil block, Petronas said in a statement Wednesday.

The company was responding to media reports that Petronas is in talks to acquire OGX's 40% interest in the Tubarao Martelo oil block in Brazil's Campos Basin.

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